# CVE-2026-31768: Linux Kernel ti-adc161s626 DMA-safe memory corruption

Source: https://junglewise.ai/threats/cve-2026-31768-linux-kernel-ti-adc161s626-dma-safe-memory-corruption  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-05-01. Updated: 2026-07-14  
License: CC BY 4.0 with a link back

CVE-2026-31768 · Severity: high · CVSS 7.8 · Published 2026-05-01

A vulnerability was identified in the Linux kernel's driver for certain Texas Instruments analog-to-digital converters (ADC). The issue stems from the use of unsafe memory locations for data transfers, which could allow a local attacker to compromise the integrity or confidentiality of the system. This affects various industrial control systems, such as Siemens SIMATIC S7-1500 CPUs, that utilize these kernel drivers.

Technologies: [Linux Kernel](https://junglewise.ai/threats/technologies/kernel), [Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP](https://junglewise.ai/threats/technologies/simatic-s7-1500-cpu-1518-4-pn-dp-mfp), [Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP](https://junglewise.ai/threats/technologies/simatic-s7-1500-cpu-1518f-4-pn-dp-mfp), [Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP](https://junglewise.ai/threats/technologies/siplus-s7-1500-cpu-1518-4-pn-dp-mfp). Vendors: [Linux](https://junglewise.ai/threats/vendors/linux), [Siemens](https://junglewise.ai/threats/vendors/siemens).

## Quick answers

**Is CVE-2026-31768 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-31768 being exploited in the wild.

**How severe is CVE-2026-31768?** High severity, with a CVSS score of 7.8, published 1 May 2026.

**Which products and versions are affected?** Linux Kernel versions from 4.9 up to 6.1.168; 6.2 up to 6.6.134; 6.7 up to 6.12.81; 6.13 up to 6.18.22; 6.19 up to 6.19.12; 7.0-rc1 to 7.0-rc6; Linux Kernel 4d671b71beef to b3bb8faeca1a2ef7be95ee8a512b639f9ffce947; Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP V3.1.5, V3.1.6; Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP V3.1.5, V3.1.6; and 1 more.

**Is there a fix for CVE-2026-31768?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**How is CVE-2026-31768 attacked?** It is attacked with local access, in an operating system.

**Am I affected by CVE-2026-31768?** Check whether you run Linux Kernel, Linux Kernel, Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability exists in the ti-adc161s626 ADC driver within the Industrial I/O (IIO) subsystem of the Linux kernel. The driver incorrectly used stack-allocated memory for SPI receive buffers via spi_read(). In the Linux kernel, all buffers used for SPI DMA transfers must be DMA-safe (typically heap-allocated and cache-aligned) to prevent memory corruption or data leakage caused by cache incoherency or architectural constraints on DMA access to stack memory. A local attacker with low privileges could potentially exploit this to cause a system crash or achieve escalated privileges. The fix involves migrating the buffer to a DMA-safe member within the driver's private data structure.

## Affected products

- Linux Linux Kernel 4d671b71beef to b3bb8faeca1a2ef7be95ee8a512b639f9ffce947
- Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP V3.1.5, V3.1.6
- Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP V3.1.5, V3.1.6
- Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP V3.1.5, V3.1.6

## Timeline

- 2026-03-14: other: Patch authored
- 2026-05-01: disclosed: CVE published
- 2026-07-14: advisory: Siemens advisory updated with affected products

## References

- [https://git.kernel.org/stable/c/014c6d27878d3883f7bb065610768fd021de1a96](https://git.kernel.org/stable/c/014c6d27878d3883f7bb065610768fd021de1a96)
- [https://git.kernel.org/stable/c/67b3a91bdc48220bfb67155ab528121b9c822782](https://git.kernel.org/stable/c/67b3a91bdc48220bfb67155ab528121b9c822782)
- [https://git.kernel.org/stable/c/768461517a28d80fe81ea4d5d03a90cd184ea6ad](https://git.kernel.org/stable/c/768461517a28d80fe81ea4d5d03a90cd184ea6ad)
- [https://git.kernel.org/stable/c/b3bb8faeca1a2ef7be95ee8a512b639f9ffce947](https://git.kernel.org/stable/c/b3bb8faeca1a2ef7be95ee8a512b639f9ffce947)
- [https://git.kernel.org/stable/c/d2d031b0786ea66ab0577c9d2d71435068d32199](https://git.kernel.org/stable/c/d2d031b0786ea66ab0577c9d2d71435068d32199)
- [https://git.kernel.org/stable/c/fa64aab25aba47296aa8d12bb4c88ec3fecb2054](https://git.kernel.org/stable/c/fa64aab25aba47296aa8d12bb4c88ec3fecb2054)
- [https://cert-portal.siemens.com/productcert/html/ssa-019113.html](https://cert-portal.siemens.com/productcert/html/ssa-019113.html)

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